I went to settings, keyboard, keyboard shortcuts, accessibility. Unfortunately, there is no option here for Voice Control, which is a bit maddening.
Then I used this article that you provided, followed the instructions and clicked voice control. I can now turn voice control on and off by pressing the touch ID three times quickly. This is a bit cumbersome because I have chronic pain from too much typing. Also, if I don't click fast enough, the touch ID thinks I'm locking the computer, and my computer locks. I can also click option-command-F5. Not ideal, but better than nothing.
If someone knows a better way, to press ONE key ONE TIME for MacOS 15.3.1 that would be great. I love Apple, but sometimes these things make no sense... Thanks for your help!!